Hand exercise device



FIG. 1 is a front elevational view of a hand exercise device showing my new design, the side opposite being identical;

FIG. 2 is a side elevational view thereof, the side opposite being identical;

FIG. 3 is a top plan view thereof; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a hand exercise device, as shown and described. 